Showing how close they are, sisters Jill and Jessa Duggar plan to get pregnant at same time

Sisters Jill Duggar-Dillard (left) and Jessa Duggar-Seewald are truly inseparable.(Instagram/ jillmdillard)

The Duggar siblings from the former TLC show "19 Kids and Counting" have always been as thick as thieves. Even now when they have started raising families of their own, sisters Jill Dillard and Jessa Seewald are proving just how close they are to each other by synchronising even their pregnancy schedules.

During the season finale of their new show "Jill and Jessa: Counting On," the two were asked, "Which of the two of you will have your second child first?"

"It's hard to say," Jessa answered with a smile, then looked at Jill.

"I think we will probably be pregnant at the same time," Jill then said. "But to say who will be first, well Israel is older... so we will see."

A lot of people have actually been speculating that Jill is already pregnant with her second child, but she said that there's no truth to the rumours.

"I'm not pregnant yet, that's the question everyone keeps asking me. Not yet," she said. Even though she and her husband Derick are keen on adopting, Jill said it's likely that their second child will be biological.

"I feel like we will have another child," Israel David's mom said. "I just don't know how. It will probably be a naturalised citizen of the family. We plan to expand our family of three. We'll see."

She earlier posted a question for moms on the Dillard Family Blog on how she can get her son to pick up his own toys. "I just got all his toys put back in their right places. I've had him come alongside me to help pick them up and I try to make it fun for him, but since he is only one year old, I figure it will be awhile before he knows how to do it on his own. Any thoughts?" she asked.

During the first few days since the question was posted, no one answered back. Now, there are over 600 comments telling Jill that her son will probably start packing his own toys once he reaches two or three years old.